3.0 COARDS/WOCE TRACK SADCP SADCP UNIVERSITY OF RHODE ISLAND none none OLE92.FALL 00090 00090.sub 12 Apr 2002 hour mean centered on hour 10 meters mean centered on given depth average over hour The following time, space, and depth ranges for this cruise are based on the complete high-resolution data set and does not agree exactly with the ranges of this averaged subset. #DATA_DATES: 1992/10/30 22:16:00 --- to --- 1993/01/28 20:18:00 #LON_RANGE: 74.08 W --- to --- 64.57 W #LAT_RANGE: 32.20 N --- to --- 40.66 N #DEPTH_RANGE: 13 --- to --- 408 m #SAC_CRUISE_ID: 00090 #PLATFORM_NAME: M.V. Oleander (commercial container vessel) #PRINCIPAL_INVESTIGATOR_NAME: T.Rossby, E.Gottlieb, G.Schwartze #PI_INSTITUTION: University of Rhode Island #PI_COUNTRY: USA #PROJECT: The Oleander Project #CRUISE_NAME: ole92.fall #PORTS: Port Elizabeth, New Jersey --- to --- Hamilton, Bermuda #GEOGRAPHIC_REGION: Northwest Atlantic Ocean #PROCESSED_BY: Erik Gottlieb #NAVIGATION: gps #QUALITY_NAV: good #GENERAL_INFORMATION: CRUISE NOTES CHIEF SCIENTIST ON SHIP : none SIGNIFICANT DATA GAPS :*92/11/13-92/11/19 software failure *92/12/22-92/12/25 Christmas holiday *92/12/29-93/ 1/ 7 deck unit shut off *93/ 1/11-93/ 1/14 cable plug stressed * indicates total data loss SPECIAL SHIP TRACK PATTERNS : weekly ship schedule is as follows: Friday - leave Elizabeth (outbound) Sunday - arrive Hamilton Tuesday - leave Hamilton (inbound) Thursday - arrive Elizabeth COMMENTS : The only significant deviations from the weekly schedule are due to bad weather and port conflicts, and typically are no more than 24 hours. ADCP INSTRUMENTATION MANUFACTURER : RD Instruments (RDI) HARDWARE MODEL : RD-VM150 SERIAL NUMBERS : ADCP = 536 / XDUC = 449 FIRMWARE VERSION : 17.10 <the following 5 fields are specific to a given hardware model> TRANSMIT FREQUENCY : 153 kHz TRANSDUCER CONFIGURATION : JANUS CONCAVE ACOUSTIC BEAM WIDTH : TRANSDUCER BEAM ANGLE : 30 deg. COMMENTS : ADCP INSTALLATION METHOD/DESCRIPTION OF THE ATTACHMENT TO THE HULL : A seachest (well) is flush-welded to the vessel's hull, so that the seachest bottom is flush with the hull's outer surface (the vessel bottom is perfectly flat and smooth with no protuberances). The transducer is mounted on a top-hat which is bolted on top of the seachest, such that the transducer bottom is slightly above the level of the seachest bottom. For transducer removal, a water-tight cover plate is bolted over the seachest opening. LOCATION/DEPTH ON HULL : The seachest is located several meters foreward and starboard of the vessel's center point. Vessel draught is load- dependent, and averages about 4.9 m Hamilton-bound (outbound) and 4.4 m Elizabeth-bound (inbound). Within the database, transducer depth is set to a mean nominal depth of 4 m for all legs. REPEATABLE ATTACHMENT : YES DATE OF MOST RECENT ATTACH. : 94/4/29 ACOUSTIC WINDOW : NO COMMENTS : vessel length 117.5 m breadth 19.8 m weight 4950 tonnes speed 16 knots ADCP INSTRUMENT CONFIGURATION <these are normally documented automatically and are part of Codas database> ELZ NAR NBN (NYB) NBS SLS NWA BER DEPTH RANGE UPPER (m) : 9.5 9.5 9.5 (14) 11 20 20 9.5 DEPTH RANGE LOWER (m) :15.5 15.5 47.5 (158) 107 404 404 15.5 BIN LENGTH (m) : 1 1 1 (4) 2 8 8 1 NUMBER OF BINS : 8 8 40 (38) 50 50 50 8 TRANSMIT PULSE LENGTH (m) : 1 1 2 (4) 4 16 16 1 BOTTOM TRACKING : no no yes (yes) yes no no no BLANKING INTERVAL : ... 4 m ... ENSEMBLE AVERAGING INTERVAL : ... 300 s ... SOUND SPEED CALCULATION : ... FUNCTION OF TEMP AT TRANSDUCER ... DIRECT COMMANDS : FH00001 E0005020099 CF25 COMMENTS : A user exit program automatically resets the instrument configuration based upon geographic location. The locations are Port Elizabeth (ELZ), Verrazano Narrows (NAR), New York Bight (NYB), Slope Sea (SLS), Northwest Atlantic (NWA), and Bermuda (BER). NYB and SLS are separated by the shelf break, and SLS and NWA are separated by the mean location of the Gulf Stream. After 93/10/22 the NYB region is split into north and south regions (NBN and NBS). Prior to spring 1993 pulse length, bin length, and number of bins were varied to find the optimal value listed above. During 93/6/25- 93/8/12 a small region named test near the center of the NWA region and having an ensemble interval of several seconds was used to observe the effects of waves on data quality. ADCP DATA ACQUISITION SYSTEM SOFTWARE DEVELOPERS : RDI, Chris Humphries, Charlie Flagg, and Joe Lewkowicz SOFTWARE VERSIONS : DAS 2.48 DATA LOGGER, MAKE/MODEL : Oak Microsystems (12 MHz 386sx) ADCP/LOGGER COMMUNICATION : serial USER BUFFER VERSION : ASCII CLOCK : PC clock COMMENTS : SHIP HEADING INSTRUMENT MAKE/MODEL : Anschutz SYNCHRO OR STEPPER : synchro before 93/6/17, stepper after SYNCHRO RATIO : 360:1 COMPENSATION APPLIED : NO GPS ATTITUDE SYSTEM : Ashtech 3DF installed 94/9/24 LOCATION OF ANTENNAS : Array located on port forward corner of flying bridge, in an L shape with about 3.5 m baseline distance between antennas. RIGID ATTACHMENT : YES - stainless steel rods clamped to brackets welded to rail.\\011 LOGGING RATE : 1 per sec COMMENTS : Prior to 93/4/15 the gyrocompass exhibited resets , where it would unexpectedly slew to 0 but then continue to track vessel heading. Since the vessel steams a very nearly constant heading, the resets were corrected for by taking the difference in headings before and after the reset and applying that difference as a heading misalignment angle. During 92/10/30-93/2/27 calibration values for heading misalignment and scale factor were obtained directly from bottom tracking each trip. Between 93/2/27-93/4/15 data are of very poor quality due to bad weather (see QUALITY ASSESSMENT ) and have not been calibrated. The reset problem was solved by using a separate repeater and computer to bypass the DAS-aquired gyrocompass heading. For calibration method after 93/4/15, see CALIBRATION . ANCILLARY MEASUREMENTS SURFACE TEMP AND SALINITY : thermistor at transducer; no salinity PITCH/ROLL MEASUREMENTS : none HYDRO CAST MEASUREMENTS : none BIOMASS DETERMINATION : YES - Using AGCAVE.COM DATE OF LAST CALIBRATION : CALIBRATION COEFFICIENTS : BEAM-AVERAGED AGC AVAILABLE?: YES CALIBRATION NET TOWS? : YES - Plankton recorder towed one trip per month COMMENTS : NAVIGATION TRANSIT : NO GPS : YES MAKE/MODEL : Magnavox MX4200 SELECTIVE AVAILABILITY : YES P-CODE : NO DIFFERENTIAL : NO SAMPLE INTERVAL : 1 per sec LOCATION OF ANTENNA RELATIVE TO TRANSDUCER : antenna on flying bridge, roughly 80 m aft, 8 m to port TIME OBTAINED RELATIVE TO START/END OF ENSEMBLE : end AVERAGING/EDITING APPLIED : LOGGED WITH ADCP DATA : YES - user exit program LOGGED INDEPENDENTLY : NO COMMENTS : OTHER : ADCP DATA PROCESSING/EDITING PERSONNEL IN CHARGE : E. Gottlieb SOUND SPEED CORRECTIONS : applied using transducer temperature DATE OF PROCESSING : 1993-95 NOTABLE SCATTERING LAYERS : almost every trip a vertically migrating scattering layer is observed just off the shelf break COMMENTS : CALIBRATION GYROCOMPASS CORRECTION : YES - from bottom tracking WATER TRACK METHOD : NO - ship never stops during trip BOTTOM TRACK METHOD : YES AMOUNT OF TIME AVAILABLE : about 6 hours/trip (=about 12.5%) TOTAL No. CALIBRATION PTS: one/trip (after reducing residuals) TIME VARIANT : VELOCITY DEPENDENT : MAYBE - has not yet been observed HEADING DEPENDENT : YES - depending on outbound (heading about 135 deg. T) or inbound (about 315) OUTBOUND INBOUND NUMBER OF TRIPS : 21 19 AMPLITUDE MIN : 1.001 1.001 AMPLITUDE MEAN : 1.014 1.044 AMPLITUDE MAX : 1.047 1.230 AMPLITUDE STD : 0.012 0.055 PHASE MIN : -1.61 0.21 PHASE MEAN : -1.36 0.56 PHASE MAX : -0.74 1.05 PHASE STD : 0.21 0.19 FINAL SELECTION AMPLITUDE : 1.0 1.0 FINAL SELECTION PHASE : -1.4 0.6 AGREEMENT WITH PREVIOUS CRUISES : see statistics above COMMENTS : Bottom tracking is done for about six hours each trip (while traversing the shelf), and after reducing residuals a single value of amplitude and phase is obtained for each trip. Statistics are done for all available trips (see above) and the final selection values (assumed constant over the entire trip) have been used to correct all trips. For calibration method prior to 93/4/16 see SHIP HEADING . NAVIGATION CALCULATION NAVIGATION USED : gps REFERENCE LAYER DEPTH RANGE : bins 5 - 15 FILTERING METHOD FOR SMOOTHING REFERENCE LAYER VELOCITY (FORM/WIDTH) : Blackman window, half-width = 0.5 hour FINALIZED SHIP VEL/POSITIONS STORED IN DATABASE : YES COMMENTS : QUALITY ASSESSMENT ON-STATION VS. UNDERWAY : All data underway, no stations. Quality ranges from excellent to poor depending on load and sea state. VECTOR, CONTOUR, STICK PLOTS: excellent to poor COMMENTS : Data quality is dependent upon load and sea state, most likely due to signal attenuation by a bubble layer under the hull (the hull bottom is perfectly flat). For a quiet seas outbound trips are of excellent quality and inbound are fair; for very heavy seas most data are poor. For moderate seas overall quality ranges from good to marginal. REFERENCES (DATA REPORTS,ETC) : Gottlieb, Rossby, Schwartze, Cornillon, and Flagg (1994). The Oleander Project First-Year Results: Gulf Stream ADCP Measurements from October 1992 to October 1993. Proceedings from the Atlantic Climate Change Program meeting, May 1994, Princeton, NJ. ed. Anne-Marie Wilburn. Gottlieb, Rossby, Schwartze, and Flagg (1995). The Oleander Project: Measuring the Gulf Stream using and ADCP mounted on a Volunteer Observing Ship. Proceedings from the Atlantic Climate Change Program meeting, May 1995, Miami, Florida. ed. Anne-Marie Wilburn. (both available upon request from Anne-Marie Wilburn, AOML/NOAA, 4301 Rickenbacker Cswy, Miami, FL 33149 -or- wilburn@aoml.erl.gov) time depth meters down 40.00000000000000 120.0000000000000 time minutes since 1980-1-1 0:0:0 6311520 6838499 Decimal Day days relative to 1992-1-1 0:0:0 303.9544200000000 393.8301600000000 WOCE date yyyymmdd UTC 19921030 19930128 WOCE time of day hhmmss.dd UTC 0.000000000000000 235959.1200000000 longitude degrees_E -74.06560000000000 -64.57150000000000 -180.0000000000000 180.0000000000000 nominally GPS 99999.0000 %9.4f f9.4 latitude degrees_N 32.21560000000000 40.64730000000000 -90.00000000000000 90.00000000000000 nominally GPS 99999.0000 %8.4f f8.4 ADCP transducer temperature degrees C 3.600000000000000 26.30000000000000 99999.0000 nominally thermistor 0.000000000000000 40.00000000000000 %4.1f f4.1 transducer temperature (standard deviation) degrees C 0.000000000000000 2.830000000000000 99999.0000 nominally thermistor 0.000000000000000 40.00000000000000 %5.2f f5.2 eastward ship speed (hourly mean) meters per second -7.200000000000000 7.000000000000000 99999.0000 optimized position based on ADCP and GPS -15.00000000000000 15.00000000000000 %5.1f f5.1 eastward ship speed (standard deviation) meters per second 0.000000000000000 2.660000000000000 99999.0000 optimized position based on ADCP and GPS 0.000000000000000 15.00000000000000 %5.2f f5.2 northward ship speed (hourly mean) meters per second -7.700000000000000 7.500000000000000 99999.0000 optimized position based on ADCP and GPS -15.00000000000000 15.00000000000000 %5.1f f5.1 northward ship speed (standard deviation) meters per second 0.000000000000000 0.000000000000000 99999.0000 optimized position based on ADCP and GPS 0.000000000000000 15.00000000000000 %5.2f f5.2 eastward absolute current velocity (hourly mean) meters per second -1.589000000000000 4.099000000000000 99999.0000 ADCP/GPS -9.900000000000000 9.900000000000000 %6.3f f6.3 northward absolute current velocity (hourly mean) meters per second -4.030000000000000 1.926000000000000 99999.0000 ADCP/GPS -9.900000000000000 9.900000000000000 %6.3f f6.3